Roller Coaster temperature : Global warming?

Its summer, it's hot... ermm no? it was 13'c 2days back, but wait... 2weeks back it was 45'c with extreme heat alert from the bureau... and it was 40'c last friday, but look at the temperature... it's so hard to stand.. if it's hot, make it constantly hot so that the body get used to it... when weather keeps changing.. it's very very hard to stand both physically and psychologically....